Trainer's Choice follows a simple concept. Rather than recognizing the silhouette of a Pokémon, viewers are asked a question about a Pokémon and instructed to choose the best of three possible answers, usually over a commercial break when watched on TV. Generally, the viewer is asked to determine which Pokémon has a type advantage over another; though other kinds of questions have been asked. The feature is narrated by Ash Ketchum.

As the successor to the long-running "Who's That Pokémon?", Trainer's Choice was initially met with criticism from some of the fandom, especially considering the change was in the middle of a newly-started saga. 4Kids Entertainment very frequently made Pokémon type match-up errors, resulting in incorrect answers given to at least nine questions, questions with multiple correct answers, questions with no possible correct answer and questions with no right or wrong answer at all. The company also occasionally misspelled the names of Pokémon or gave them the wrong name altogether. These constant mistakes were seen by many as an indication that 4Kids actually knew very little about the franchise. The most infamous example is their erroneous claim that Seviper evolves from Arbok, featured in the Trainer's Choice of A Fan with a Plan; this Trainer's Choice in particular is a source of ridicule by many fans.

In Pokémon: Advanced Battle, the creation of questions for Trainer's Choice was credited to Lawrence Neves and the accuracy rate greatly improved. During this season, the variety in the types of questions being asked expanded beyond simply type match-ups and evolutionary lines, as well as featuring more difficult questions.

List of questions

Answers deemed correct are in bold, while misnomers and misspelled names have sic to the right of them.

While each choice is at a disadvantage, Camerupt resists both of Beedrill's types and Magcargo has a doubleweakness to Ground. Nuzleaf has a normal weakness and can still deal neutral damage with its Grass and Dark attacks.

Whilst Dewgong does have an advantage against the Bug/Flying Ninjask, Torkoal and Nosepass would also be goodchoices. Though Nosepass is the best choice since it resists Flying and is effective against both Bug and Flying.

This is incorrect because Combusken is weak to Psychic. Beautifly would be the best choice since it has an advantage and a doubleresistance to Fighting.Also, Nuzleaf's name appears under Beautifly's image. If Nuzleaf was meant to be one of the choices, it would be the best, since all choices would then be weak to one of Meditite's types, but Nuzleaf would be immune to the other.

At the time, neither choice was correct based on type match-ups because neither Fire nor Psychic has an advantage over the other. Starting in Generation VI, however, this is correct because Arcanine resists Kirlia's Fairy typing.Also, this is the only Trainer's Choice with two choices instead of three.